diff options
Diffstat (limited to 'xen/arch/x86/hvm/ioreq.c')
| -rw-r--r-- | xen/arch/x86/hvm/ioreq.c | 1242 |
1 files changed, 0 insertions, 1242 deletions
diff --git a/xen/arch/x86/hvm/ioreq.c b/xen/arch/x86/hvm/ioreq.c index 36b1e4e19b..b03ceee97b 100644 --- a/xen/arch/x86/hvm/ioreq.c +++ b/xen/arch/x86/hvm/ioreq.c @@ -41,140 +41,6 @@ bool ioreq_complete_mmio(void) return handle_mmio(); } -static void set_ioreq_server(struct domain *d, unsigned int id, - struct hvm_ioreq_server *s) -{ - ASSERT(id < MAX_NR_IOREQ_SERVERS); - ASSERT(!s || !d->arch.hvm.ioreq_server.server[id]); - - d->arch.hvm.ioreq_server.server[id] = s; -} - -#define GET_IOREQ_SERVER(d, id) \ - (d)->arch.hvm.ioreq_server.server[id] - -static struct hvm_ioreq_server *get_ioreq_server(const struct domain *d, - unsigned int id) -{ - if ( id >= MAX_NR_IOREQ_SERVERS ) - return NULL; - - return GET_IOREQ_SERVER(d, id); -} - -/* - * Iterate over all possible ioreq servers. - * - * NOTE: The iteration is backwards such that more recently created - * ioreq servers are favoured in hvm_select_ioreq_server(). - * This is a semantic that previously existed when ioreq servers - * were held in a linked list. - */ -#define FOR_EACH_IOREQ_SERVER(d, id, s) \ - for ( (id) = MAX_NR_IOREQ_SERVERS; (id) != 0; ) \ - if ( !(s = GET_IOREQ_SERVER(d, --(id))) ) \ - continue; \ - else - -static ioreq_t *get_ioreq(struct hvm_ioreq_server *s, struct vcpu *v) -{ - shared_iopage_t *p = s->ioreq.va; - - ASSERT((v == current) || !vcpu_runnable(v)); - ASSERT(p != NULL); - - return &p->vcpu_ioreq[v->vcpu_id]; -} - -static struct hvm_ioreq_vcpu *get_pending_vcpu(const struct vcpu *v, - struct hvm_ioreq_server **srvp) -{ - struct domain *d = v->domain; - struct hvm_ioreq_server *s; - unsigned int id; - - FOR_EACH_IOREQ_SERVER(d, id, s) - { - struct hvm_ioreq_vcpu *sv; - - list_for_each_entry ( sv, - &s->ioreq_vcpu_list, - list_entry ) - { - if ( sv->vcpu == v && sv->pending ) - { - if ( srvp ) - *srvp = s; - return sv; - } - } - } - - return NULL; -} - -bool hvm_io_pending(struct vcpu *v) -{ - return get_pending_vcpu(v, NULL); -} - -static bool hvm_wait_for_io(struct hvm_ioreq_vcpu *sv, ioreq_t *p) -{ - unsigned int prev_state = STATE_IOREQ_NONE; - unsigned int state = p->state; - uint64_t data = ~0; - - smp_rmb(); - - /* - * The only reason we should see this condition be false is when an - * emulator dying races with I/O being requested. - */ - while ( likely(state != STATE_IOREQ_NONE) ) - { - if ( unlikely(state < prev_state) ) - { - gdprintk(XENLOG_ERR, "Weird HVM ioreq state transition %u -> %u\n", - prev_state, state); - sv->pending = false; - domain_crash(sv->vcpu->domain); - return false; /* bail */ - } - - switch ( prev_state = state ) - { - case STATE_IORESP_READY: /* IORESP_READY -> NONE */ - p->state = STATE_IOREQ_NONE; - data = p->data; - break; - - case STATE_IOREQ_READY: /* IOREQ_{READY,INPROCESS} -> IORESP_READY */ - case STATE_IOREQ_INPROCESS: - wait_on_xen_event_channel(sv->ioreq_evtchn, - ({ state = p->state; - smp_rmb(); - state != prev_state; })); - continue; - - default: - gdprintk(XENLOG_ERR, "Weird HVM iorequest state %u\n", state); - sv->pending = false; - domain_crash(sv->vcpu->domain); - return false; /* bail */ - } - - break; - } - - p = &sv->vcpu->arch.hvm.hvm_io.io_req; - if ( hvm_ioreq_needs_completion(p) ) - p->data = data; - - sv->pending = false; - - return true; -} - bool arch_vcpu_ioreq_completion(enum hvm_io_completion io_completion) { switch ( io_completion ) @@ -198,52 +64,6 @@ bool arch_vcpu_ioreq_completion(enum hvm_io_completion io_completion) return true; } -bool handle_hvm_io_completion(struct vcpu *v) -{ - struct domain *d = v->domain; - struct hvm_vcpu_io *vio = &v->arch.hvm.hvm_io; - struct hvm_ioreq_server *s; - struct hvm_ioreq_vcpu *sv; - enum hvm_io_completion io_completion; - - if ( has_vpci(d) && vpci_process_pending(v) ) - { - raise_softirq(SCHEDULE_SOFTIRQ); - return false; - } - - sv = get_pending_vcpu(v, &s); - if ( sv && !hvm_wait_for_io(sv, get_ioreq(s, v)) ) - return false; - - vio->io_req.state = hvm_ioreq_needs_completion(&vio->io_req) ? - STATE_IORESP_READY : STATE_IOREQ_NONE; - - msix_write_completion(v); - vcpu_end_shutdown_deferral(v); - - io_completion = vio->io_completion; - vio->io_completion = HVMIO_no_completion; - - switch ( io_completion ) - { - case HVMIO_no_completion: - break; - - case HVMIO_mmio_completion: - return ioreq_complete_mmio(); - - case HVMIO_pio_completion: - return handle_pio(vio->io_req.addr, vio->io_req.size, - vio->io_req.dir); - - default: - return arch_vcpu_ioreq_completion(io_completion); - } - - return true; -} - static gfn_t hvm_alloc_legacy_ioreq_gfn(struct hvm_ioreq_server *s) { struct domain *d = s->target; @@ -360,93 +180,6 @@ static int hvm_map_ioreq_gfn(struct hvm_ioreq_server *s, bool buf) return rc; } -static int hvm_alloc_ioreq_mfn(struct hvm_ioreq_server *s, bool buf) -{ - struct hvm_ioreq_page *iorp = buf ? &s->bufioreq : &s->ioreq; - struct page_info *page; - - if ( iorp->page ) - { - /* - * If a guest frame has already been mapped (which may happen - * on demand if hvm_get_ioreq_server_info() is called), then - * allocating a page is not permitted. - */ - if ( !gfn_eq(iorp->gfn, INVALID_GFN) ) - return -EPERM; - - return 0; - } - - page = alloc_domheap_page(s->target, MEMF_no_refcount); - - if ( !page ) - return -ENOMEM; - - if ( !get_page_and_type(page, s->target, PGT_writable_page) ) - { - /* - * The domain can't possibly know about this page yet, so failure - * here is a clear indication of something fishy going on. - */ - domain_crash(s->emulator); - return -ENODATA; - } - - iorp->va = __map_domain_page_global(page); - if ( !iorp->va ) - goto fail; - - iorp->page = page; - clear_page(iorp->va); - return 0; - - fail: - put_page_alloc_ref(page); - put_page_and_type(page); - - return -ENOMEM; -} - -static void hvm_free_ioreq_mfn(struct hvm_ioreq_server *s, bool buf) -{ - struct hvm_ioreq_page *iorp = buf ? &s->bufioreq : &s->ioreq; - struct page_info *page = iorp->page; - - if ( !page ) - return; - - iorp->page = NULL; - - unmap_domain_page_global(iorp->va); - iorp->va = NULL; - - put_page_alloc_ref(page); - put_page_and_type(page); -} - -bool is_ioreq_server_page(struct domain *d, const struct page_info *page) -{ - const struct hvm_ioreq_server *s; - unsigned int id; - bool found = false; - - spin_lock_recursive(&d->arch.hvm.ioreq_server.lock); - - FOR_EACH_IOREQ_SERVER(d, id, s) - { - if ( (s->ioreq.page == page) || (s->bufioreq.page == page) ) - { - found = true; - break; - } - } - - spin_unlock_recursive(&d->arch.hvm.ioreq_server.lock); - - return found; -} - static void hvm_remove_ioreq_gfn(struct hvm_ioreq_server *s, bool buf) { @@ -481,125 +214,6 @@ static int hvm_add_ioreq_gfn(struct hvm_ioreq_server *s, bool buf) return rc; } -static void hvm_update_ioreq_evtchn(struct hvm_ioreq_server *s, - struct hvm_ioreq_vcpu *sv) -{ - ASSERT(spin_is_locked(&s->lock)); - - if ( s->ioreq.va != NULL ) - { - ioreq_t *p = get_ioreq(s, sv->vcpu); - - p->vp_eport = sv->ioreq_evtchn; - } -} - -static int hvm_ioreq_server_add_vcpu(struct hvm_ioreq_server *s, - struct vcpu *v) -{ - struct hvm_ioreq_vcpu *sv; - int rc; - - sv = xzalloc(struct hvm_ioreq_vcpu); - - rc = -ENOMEM; - if ( !sv ) - goto fail1; - - spin_lock(&s->lock); - - rc = alloc_unbound_xen_event_channel(v->domain, v->vcpu_id, - s->emulator->domain_id, NULL); - if ( rc < 0 ) - goto fail2; - - sv->ioreq_evtchn = rc; - - if ( v->vcpu_id == 0 && HANDLE_BUFIOREQ(s) ) - { - rc = alloc_unbound_xen_event_channel(v->domain, 0, - s->emulator->domain_id, NULL); - if ( rc < 0 ) - goto fail3; - - s->bufioreq_evtchn = rc; - } - - sv->vcpu = v; - - list_add(&sv->list_entry, &s->ioreq_vcpu_list); - - if ( s->enabled ) - hvm_update_ioreq_evtchn(s, sv); - - spin_unlock(&s->lock); - return 0; - - fail3: - free_xen_event_channel(v->domain, sv->ioreq_evtchn); - - fail2: - spin_unlock(&s->lock); - xfree(sv); - - fail1: - return rc; -} - -static void hvm_ioreq_server_remove_vcpu(struct hvm_ioreq_server *s, - struct vcpu *v) -{ - struct hvm_ioreq_vcpu *sv; - - spin_lock(&s->lock); - - list_for_each_entry ( sv, - &s->ioreq_vcpu_list, - list_entry ) - { - if ( sv->vcpu != v ) - continue; - - list_del(&sv->list_entry); - - if ( v->vcpu_id == 0 && HANDLE_BUFIOREQ(s) ) - free_xen_event_channel(v->domain, s->bufioreq_evtchn); - - free_xen_event_channel(v->domain, sv->ioreq_evtchn); - - xfree(sv); - break; - } - - spin_unlock(&s->lock); -} - -static void hvm_ioreq_server_remove_all_vcpus(struct hvm_ioreq_server *s) -{ - struct hvm_ioreq_vcpu *sv, *next; - - spin_lock(&s->lock); - - list_for_each_entry_safe ( sv, - next, - &s->ioreq_vcpu_list, - list_entry ) - { - struct vcpu *v = sv->vcpu; - - list_del(&sv->list_entry); - - if ( v->vcpu_id == 0 && HANDLE_BUFIOREQ(s) ) - free_xen_event_channel(v->domain, s->bufioreq_evtchn); - - free_xen_event_channel(v->domain, sv->ioreq_evtchn); - - xfree(sv); - } - - spin_unlock(&s->lock); -} - int arch_ioreq_server_map_pages(struct hvm_ioreq_server *s) { int rc; @@ -621,495 +235,24 @@ void arch_ioreq_server_unmap_pages(struct hvm_ioreq_server *s) hvm_unmap_ioreq_gfn(s, false); } -static int hvm_ioreq_server_alloc_pages(struct hvm_ioreq_server *s) -{ - int rc; - - rc = hvm_alloc_ioreq_mfn(s, false); - - if ( !rc && (s->bufioreq_handling != HVM_IOREQSRV_BUFIOREQ_OFF) ) - rc = hvm_alloc_ioreq_mfn(s, true); - - if ( rc ) - hvm_free_ioreq_mfn(s, false); - - return rc; -} - -static void hvm_ioreq_server_free_pages(struct hvm_ioreq_server *s) -{ - hvm_free_ioreq_mfn(s, true); - hvm_free_ioreq_mfn(s, false); -} - -static void hvm_ioreq_server_free_rangesets(struct hvm_ioreq_server *s) -{ - unsigned int i; - - for ( i = 0; i < NR_IO_RANGE_TYPES; i++ ) - rangeset_destroy(s->range[i]); -} - -static int hvm_ioreq_server_alloc_rangesets(struct hvm_ioreq_server *s, - ioservid_t id) -{ - unsigned int i; - int rc; - - for ( i = 0; i < NR_IO_RANGE_TYPES; i++ ) - { - char *name; - - rc = asprintf(&name, "ioreq_server %d %s", id, - (i == XEN_DMOP_IO_RANGE_PORT) ? "port" : - (i == XEN_DMOP_IO_RANGE_MEMORY) ? "memory" : - (i == XEN_DMOP_IO_RANGE_PCI) ? "pci" : - ""); - if ( rc ) - goto fail; - - s->range[i] = rangeset_new(s->target, name, - RANGESETF_prettyprint_hex); - - xfree(name); - - rc = -ENOMEM; - if ( !s->range[i] ) - goto fail; - - rangeset_limit(s->range[i], MAX_NR_IO_RANGES); - } - - return 0; - - fail: - hvm_ioreq_server_free_rangesets(s); - - return rc; -} - void arch_ioreq_server_enable(struct hvm_ioreq_server *s) { hvm_remove_ioreq_gfn(s, false); hvm_remove_ioreq_gfn(s, true); } -static void hvm_ioreq_server_enable(struct hvm_ioreq_server *s) -{ - struct hvm_ioreq_vcpu *sv; - - spin_lock(&s->lock); - - if ( s->enabled ) - goto done; - - arch_ioreq_server_enable(s); - - s->enabled = true; - - list_for_each_entry ( sv, - &s->ioreq_vcpu_list, - list_entry ) - hvm_update_ioreq_evtchn(s, sv); - - done: - spin_unlock(&s->lock); -} - void arch_ioreq_server_disable(struct hvm_ioreq_server *s) { hvm_add_ioreq_gfn(s, true); hvm_add_ioreq_gfn(s, false); } -static void hvm_ioreq_server_disable(struct hvm_ioreq_server *s) -{ - spin_lock(&s->lock); - - if ( !s->enabled ) - goto done; - - arch_ioreq_server_disable(s); - - s->enabled = false; - - done: - spin_unlock(&s->lock); -} - -static int hvm_ioreq_server_init(struct hvm_ioreq_server *s, - struct domain *d, int bufioreq_handling, - ioservid_t id) -{ - struct domain *currd = current->domain; - struct vcpu *v; - int rc; - - s->target = d; - - get_knownalive_domain(currd); - s->emulator = currd; - - spin_lock_init(&s->lock); - INIT_LIST_HEAD(&s->ioreq_vcpu_list); - spin_lock_init(&s->bufioreq_lock); - - s->ioreq.gfn = INVALID_GFN; - s->bufioreq.gfn = INVALID_GFN; - - rc = hvm_ioreq_server_alloc_rangesets(s, id); - if ( rc ) - return rc; - - s->bufioreq_handling = bufioreq_handling; - - for_each_vcpu ( d, v ) - { - rc = hvm_ioreq_server_add_vcpu(s, v); - if ( rc ) - goto fail_add; - } - - return 0; - - fail_add: - hvm_ioreq_server_remove_all_vcpus(s); - arch_ioreq_server_unmap_pages(s); - - hvm_ioreq_server_free_rangesets(s); - - put_domain(s->emulator); - return rc; -} - -static void hvm_ioreq_server_deinit(struct hvm_ioreq_server *s) -{ - ASSERT(!s->enabled); - hvm_ioreq_server_remove_all_vcpus(s); - - /* - * NOTE: It is safe to call both arch_ioreq_server_unmap_pages() and - * hvm_ioreq_server_free_pages() in that order. - * This is because the former will do nothing if the pages - * are not mapped, leaving the page to be freed by the latter. - * However if the pages are mapped then the former will set - * the page_info pointer to NULL, meaning the latter will do - * nothing. - */ - arch_ioreq_server_unmap_pages(s); - hvm_ioreq_server_free_pages(s); - - hvm_ioreq_server_free_rangesets(s); - - put_domain(s->emulator); -} - -int hvm_create_ioreq_server(struct domain *d, int bufioreq_handling, - ioservid_t *id) -{ - struct hvm_ioreq_server *s; - unsigned int i; - int rc; - - if ( bufioreq_handling > HVM_IOREQSRV_BUFIOREQ_ATOMIC ) - return -EINVAL; - - s = xzalloc(struct hvm_ioreq_server); - if ( !s ) - return -ENOMEM; - - domain_pause(d); - spin_lock_recursive(&d->arch.hvm.ioreq_server.lock); - - for ( i = 0; i < MAX_NR_IOREQ_SERVERS; i++ ) - { - if ( !GET_IOREQ_SERVER(d, i) ) - break; - } - - rc = -ENOSPC; - if ( i >= MAX_NR_IOREQ_SERVERS ) - goto fail; - - /* - * It is safe to call set_ioreq_server() prior to - * hvm_ioreq_server_init() since the target domain is paused. - */ - set_ioreq_server(d, i, s); - - rc = hvm_ioreq_server_init(s, d, bufioreq_handling, i); - if ( rc ) - { - set_ioreq_server(d, i, NULL); - goto fail; - } - - if ( id ) - *id = i; - - spin_unlock_recursive(&d->arch.hvm.ioreq_server.lock); - domain_unpause(d); - - return 0; - - fail: - spin_unlock_recursive(&d->arch.hvm.ioreq_server.lock); - domain_unpause(d); - - xfree(s); - return rc; -} - /* Called when target domain is paused */ void arch_ioreq_server_destroy(struct hvm_ioreq_server *s) { p2m_set_ioreq_server(s->target, 0, s); } -int hvm_destroy_ioreq_server(struct domain *d, ioservid_t id) -{ - struct hvm_ioreq_server *s; - int rc; - - spin_lock_recursive(&d->arch.hvm.ioreq_server.lock); - - s = get_ioreq_server(d, id); - - rc = -ENOENT; - if ( !s ) - goto out; - - rc = -EPERM; - if ( s->emulator != current->domain ) - goto out; - - domain_pause(d); - - arch_ioreq_server_destroy(s); - - hvm_ioreq_server_disable(s); - - /* - * It is safe to call hvm_ioreq_server_deinit() prior to - * set_ioreq_server() since the target domain is paused. - */ - hvm_ioreq_server_deinit(s); - set_ioreq_server(d, id, NULL); - - domain_unpause(d); - - xfree(s); - - rc = 0; - - out: - spin_unlock_recursive(&d->arch.hvm.ioreq_server.lock); - - return rc; -} - -int hvm_get_ioreq_server_info(struct domain *d, ioservid_t id, - unsigned long *ioreq_gfn, - unsigned long *bufioreq_gfn, - evtchn_port_t *bufioreq_port) -{ - struct hvm_ioreq_server *s; - int rc; - - spin_lock_recursive(&d->arch.hvm.ioreq_server.lock); - - s = get_ioreq_server(d, id); - - rc = -ENOENT; - if ( !s ) - goto out; - - rc = -EPERM; - if ( s->emulator != current->domain ) - goto out; - - if ( ioreq_gfn || bufioreq_gfn ) - { - rc = arch_ioreq_server_map_pages(s); - if ( rc ) - goto out; - } - - if ( ioreq_gfn ) - *ioreq_gfn = gfn_x(s->ioreq.gfn); - - if ( HANDLE_BUFIOREQ(s) ) - { - if ( bufioreq_gfn ) - *bufioreq_gfn = gfn_x(s->bufioreq.gfn); - - if ( bufioreq_port ) - *bufioreq_port = s->bufioreq_evtchn; - } - - rc = 0; - - out: - spin_unlock_recursive(&d->arch.hvm.ioreq_server.lock); - - return rc; -} - -int hvm_get_ioreq_server_frame(struct domain *d, ioservid_t id, - unsigned long idx, mfn_t *mfn) -{ - struct hvm_ioreq_server *s; - int rc; - - ASSERT(is_hvm_domain(d)); - - spin_lock_recursive(&d->arch.hvm.ioreq_server.lock); - - s = get_ioreq_server(d, id); - - rc = -ENOENT; - if ( !s ) - goto out; - - rc = -EPERM; - if ( s->emulator != current->domain ) - goto out; - - rc = hvm_ioreq_server_alloc_pages(s); - if ( rc ) - goto out; - - switch ( idx ) - { - case XENMEM_resource_ioreq_server_frame_bufioreq: - rc = -ENOENT; - if ( !HANDLE_BUFIOREQ(s) ) - goto out; - - *mfn = page_to_mfn(s->bufioreq.page); - rc = 0; - break; - - case XENMEM_resource_ioreq_server_frame_ioreq(0): - *mfn = page_to_mfn(s->ioreq.page); - rc = 0; - break; - - default: - rc = -EINVAL; - break; - } - - out: - spin_unlock_recursive(&d->arch.hvm.ioreq_server.lock); - - return rc; -} - -int hvm_map_io_range_to_ioreq_server(struct domain *d, ioservid_t id, - uint32_t type, uint64_t start, - uint64_t end) -{ - struct hvm_ioreq_server *s; - struct rangeset *r; - int rc; - - if ( start > end ) - return -EINVAL; - - spin_lock_recursive(&d->arch.hvm.ioreq_server.lock); - - s = get_ioreq_server(d, id); - - rc = -ENOENT; - if ( !s ) - goto out; - - rc = -EPERM; - if ( s->emulator != current->domain ) - goto out; - - switch ( type ) - { - case XEN_DMOP_IO_RANGE_PORT: - case XEN_DMOP_IO_RANGE_MEMORY: - case XEN_DMOP_IO_RANGE_PCI: - r = s->range[type]; - break; - - default: - r = NULL; - break; - } - - rc = -EINVAL; - if ( !r ) - goto out; - - rc = -EEXIST; - if ( rangeset_overlaps_range(r, start, end) ) - goto out; - - rc = rangeset_add_range(r, start, end); - - out: - spin_unlock_recursive(&d->arch.hvm.ioreq_server.lock); - - return rc; -} - -int hvm_unmap_io_range_from_ioreq_server(struct domain *d, ioservid_t id, - uint32_t type, uint64_t start, - uint64_t end) -{ - struct hvm_ioreq_server *s; - struct rangeset *r; - int rc; - - if ( start > end ) - return -EINVAL; - - spin_lock_recursive(&d->arch.hvm.ioreq_server.lock); - - s = get_ioreq_server(d, id); - - rc = -ENOENT; - if ( !s ) - goto out; - - rc = -EPERM; - if ( s->emulator != current->domain ) - goto out; - - switch ( type ) - { - case XEN_DMOP_IO_RANGE_PORT: - case XEN_DMOP_IO_RANGE_MEMORY: - case XEN_DMOP_IO_RANGE_PCI: - r = s->range[type]; - break; - - default: - r = NULL; - break; - } - - rc = -EINVAL; - if ( !r ) - goto out; - - rc = -ENOENT; - if ( !rangeset_contains_range(r, start, end) ) - goto out; - - rc = rangeset_remove_range(r, start, end); - - out: - spin_unlock_recursive(&d->arch.hvm.ioreq_server.lock); - - return rc; -} - /* Called with ioreq_server lock held */ int arch_ioreq_server_map_mem_type(struct domain *d, struct hvm_ioreq_server *s, @@ -1128,162 +271,11 @@ int arch_ioreq_server_map_mem_type(struct domain *d, return rc; } -/* - * Map or unmap an ioreq server to specific memory type. For now, only - * HVMMEM_ioreq_server is supported, and in the future new types can be - * introduced, e.g. HVMMEM_ioreq_serverX mapped to ioreq server X. And - * currently, only write operations are to be forwarded to an ioreq server. - * Support for the emulation of read operations can be added when an ioreq - * server has such requirement in the future. - */ -int hvm_map_mem_type_to_ioreq_server(struct domain *d, ioservid_t id, - uint32_t type, uint32_t flags) -{ - struct hvm_ioreq_server *s; - int rc; - - if ( type != HVMMEM_ioreq_server ) - return -EINVAL; - - if ( flags & ~XEN_DMOP_IOREQ_MEM_ACCESS_WRITE ) - return -EINVAL; - - spin_lock_recursive(&d->arch.hvm.ioreq_server.lock); - - s = get_ioreq_server(d, id); - - rc = -ENOENT; - if ( !s ) - goto out; - - rc = -EPERM; - if ( s->emulator != current->domain ) - goto out; - - rc = arch_ioreq_server_map_mem_type(d, s, flags); - - out: - spin_unlock_recursive(&d->arch.hvm.ioreq_server.lock); - - return rc; -} - -int hvm_set_ioreq_server_state(struct domain *d, ioservid_t id, - bool enabled) -{ - struct hvm_ioreq_server *s; - int rc; - - spin_lock_recursive(&d->arch.hvm.ioreq_server.lock); - - s = get_ioreq_server(d, id); - - rc = -ENOENT; - if ( !s ) - goto out; - - rc = -EPERM; - if ( s->emulator != current->domain ) - goto out; - - domain_pause(d); - - if ( enabled ) - hvm_ioreq_server_enable(s); - else - hvm_ioreq_server_disable(s); - - domain_unpause(d); - - rc = 0; - - out: - spin_unlock_recursive(&d->arch.hvm.ioreq_server.lock); - return rc; -} - -int hvm_all_ioreq_servers_add_vcpu(struct domain *d, struct vcpu *v) -{ - struct hvm_ioreq_server *s; - unsigned int id; - int rc; - - spin_lock_recursive(&d->arch.hvm.ioreq_server.lock); - - FOR_EACH_IOREQ_SERVER(d, id, s) - { - rc = hvm_ioreq_server_add_vcpu(s, v); - if ( rc ) - goto fail; - } - - spin_unlock_recursive(&d->arch.hvm.ioreq_server.lock); - - return 0; - - fail: - while ( ++id != MAX_NR_IOREQ_SERVERS ) - { - s = GET_IOREQ_SERVER(d, id); - - if ( !s ) - continue; - - hvm_ioreq_server_remove_vcpu(s, v); - } - - spin_unlock_recursive(&d->arch.hvm.ioreq_server.lock); - - return rc; -} - -void hvm_all_ioreq_servers_remove_vcpu(struct domain *d, struct vcpu *v) -{ - struct hvm_ioreq_server *s; - unsigned int id; - - spin_lock_recursive(&d->arch.hvm.ioreq_server.lock); - - FOR_EACH_IOREQ_SERVER(d, id, s) - hvm_ioreq_server_remove_vcpu(s, v); - - spin_unlock_recursive(&d->arch.hvm.ioreq_server.lock); -} - bool arch_ioreq_server_destroy_all(struct domain *d) { return relocate_portio_handler(d, 0xcf8, 0xcf8, 4); } -void hvm_destroy_all_ioreq_servers(struct domain *d) -{ - struct hvm_ioreq_server *s; - unsigned int id; - - if ( !arch_ioreq_server_destroy_all(d) ) - return; - - spin_lock_recursive(&d->arch.hvm.ioreq_server.lock); - - /* No need to domain_pause() as the domain is being torn down */ - - FOR_EACH_IOREQ_SERVER(d, id, s) - { - hvm_ioreq_server_disable(s); - - /* - * It is safe to call hvm_ioreq_server_deinit() prior to - * set_ioreq_server() since the target domain is being destroyed. - */ - hvm_ioreq_server_deinit(s); - set_ioreq_server(d, id, NULL); - - xfree(s); - } - - spin_unlock_recursive(&d->arch.hvm.ioreq_server.lock); -} - int arch_ioreq_server_get_type_addr(const struct domain *d, const ioreq_t *p, uint8_t *type, @@ -1330,233 +322,6 @@ int arch_ioreq_server_get_type_addr(const struct domain *d, return 0; } -struct hvm_ioreq_server *hvm_select_ioreq_server(struct domain *d, - ioreq_t *p) -{ - struct hvm_ioreq_server *s; - uint8_t type; - uint64_t addr; - unsigned int id; - - if ( arch_ioreq_server_get_type_addr(d, p, &type, &addr) ) - return NULL; - - FOR_EACH_IOREQ_SERVER(d, id, s) - { - struct rangeset *r; - - if ( !s->enabled ) - continue; - - r = s->range[type]; - - switch ( type ) - { - unsigned long start, end; - - case XEN_DMOP_IO_RANGE_PORT: - start = addr; - end = start + p->size - 1; - if ( rangeset_contains_range(r, start, end) ) - return s; - - break; - - case XEN_DMOP_IO_RANGE_MEMORY: - start = hvm_mmio_first_byte(p); - end = hvm_mmio_last_byte(p); - - if ( rangeset_contains_range(r, start, end) ) - return s; - - break; - - case XEN_DMOP_IO_RANGE_PCI: - if ( rangeset_contains_singleton(r, addr >> 32) ) - { - p->type = IOREQ_TYPE_PCI_CONFIG; - p->addr = addr; - return s; - } - - break; - } - } - - return NULL; -} - -static int hvm_send_buffered_ioreq(struct hvm_ioreq_server *s, ioreq_t *p) -{ - struct domain *d = current->domain; - struct hvm_ioreq_page *iorp; - buffered_iopage_t *pg; - buf_ioreq_t bp = { .data = p->data, - .addr = p->addr, - .type = p->type, - .dir = p->dir }; - /* Timeoffset sends 64b data, but no address. Use two consecutive slots. */ - int qw = 0; - - /* Ensure buffered_iopage fits in a page */ - BUILD_BUG_ON(sizeof(buffered_iopage_t) > PAGE_SIZE); - - iorp = &s->bufioreq; - pg = iorp->va; - - if ( !pg ) - return IOREQ_STATUS_UNHANDLED; - - /* - * Return 0 for the cases we can't deal with: - * - 'addr' is only a 20-bit field, so we cannot address beyond 1MB - * - we cannot buffer accesses to guest memory buffers, as the guest - * may expect the memory buffer to be synchronously accessed - * - the count field is usually used with data_is_ptr and since we don't - * support data_is_ptr we do not waste space for the count field either - */ - if ( (p->addr > 0xffffful) || p->data_is_ptr || (p->count != 1) ) - return 0; - - switch ( p->size ) - { - case 1: - bp.size = 0; - break; - case 2: - bp.size = 1; - break; - case 4: - bp.size = 2; - break; - case 8: - bp.size = 3; - qw = 1; - break; - default: - gdprintk(XENLOG_WARNING, "unexpected ioreq size: %u\n", p->size); - return IOREQ_STATUS_UNHANDLED; - } - - spin_lock(&s->bufioreq_lock); - - if ( (pg->ptrs.write_pointer - pg->ptrs.read_pointer) >= - (IOREQ_BUFFER_SLOT_NUM - qw) ) - { - /* The queue is full: send the iopacket through the normal path. */ - spin_unlock(&s->bufioreq_lock); - return IOREQ_STATUS_UNHANDLED; - } - - pg->buf_ioreq[pg->ptrs.write_pointer % IOREQ_BUFFER_SLOT_NUM] = bp; - - if ( qw ) - { - bp.data = p->data >> 32; - pg->buf_ioreq[(pg->ptrs.write_pointer+1) % IOREQ_BUFFER_SLOT_NUM] = bp; - } - - /* Make the ioreq_t visible /before/ write_pointer. */ - smp_wmb(); - pg->ptrs.write_pointer += qw ? 2 : 1; - - /* Canonicalize read/write pointers to prevent their overflow. */ - while ( (s->bufioreq_handling == HVM_IOREQSRV_BUFIOREQ_ATOMIC) && - qw++ < IOREQ_BUFFER_SLOT_NUM && - pg->ptrs.read_pointer >= IOREQ_BUFFER_SLOT_NUM ) - { - union bufioreq_pointers old = pg->ptrs, new; - unsigned int n = old.read_pointer / IOREQ_BUFFER_SLOT_NUM; - - new.read_pointer = old.read_pointer - n * IOREQ_BUFFER_SLOT_NUM; - new.write_pointer = old.write_pointer - n * IOREQ_BUFFER_SLOT_NUM; - cmpxchg(&pg->ptrs.full, old.full, new.full); - } - - notify_via_xen_event_channel(d, s->bufioreq_evtchn); - spin_unlock(&s->bufioreq_lock); - - return IOREQ_STATUS_HANDLED; -} - -int hvm_send_ioreq(struct hvm_ioreq_server *s, ioreq_t *proto_p, - bool buffered) -{ - struct vcpu *curr = current; - struct domain *d = curr->domain; - struct hvm_ioreq_vcpu *sv; - - ASSERT(s); - - if ( buffered ) - return hvm_send_buffered_ioreq(s, proto_p); - - if ( unlikely(!vcpu_start_shutdown_deferral(curr)) ) - return IOREQ_STATUS_RETRY; - - list_for_each_entry ( sv, - &s->ioreq_vcpu_list, - list_entry ) - { - if ( sv->vcpu == curr ) - { - evtchn_port_t port = sv->ioreq_evtchn; - ioreq_t *p = get_ioreq(s, curr); - - if ( unlikely(p->state != STATE_IOREQ_NONE) ) - { - gprintk(XENLOG_ERR, "device model set bad IO state %d\n", - p->state); - break; - } - - if ( unlikely(p->vp_eport != port) ) - { - gprintk(XENLOG_ERR, "device model set bad event channel %d\n", - p->vp_eport); - break; - } - - proto_p->state = STATE_IOREQ_NONE; - proto_p->vp_eport = port; - *p = *proto_p; - - prepare_wait_on_xen_event_channel(port); - - /* - * Following happens /after/ blocking and setting up ioreq - * contents. prepare_wait_on_xen_event_channel() is an implicit - * barrier. - */ - p->state = STATE_IOREQ_READY; - notify_via_xen_event_channel(d, port); - - sv->pending = true; - return IOREQ_STATUS_RETRY; - } - } - - return IOREQ_STATUS_UNHANDLED; -} - -unsigned int hvm_broadcast_ioreq(ioreq_t *p, bool buffered) -{ - struct domain *d = current->domain; - struct hvm_ioreq_server *s; - unsigned int id, failed = 0; - - FOR_EACH_IOREQ_SERVER(d, id, s) - { - if ( !s->enabled ) - continue; - - if ( hvm_send_ioreq(s, p, buffered) == IOREQ_STATUS_UNHANDLED ) - failed++; - } - - return failed; -} - static int hvm_access_cf8( int dir, unsigned int port, unsigned int bytes, uint32_t *val) { @@ -1574,13 +339,6 @@ void arch_ioreq_domain_init(struct domain *d) register_portio_handler(d, 0xcf8, 4, hvm_access_cf8); } -void hvm_ioreq_init(struct domain *d) -{ - spin_lock_init(&d->arch.hvm.ioreq_server.lock); - - arch_ioreq_domain_init(d); -} - /* * Local variables: * mode: C |